Headphone



1.1 is a rear, left side perspective view of a headhone showing the new design;

1.2 is a left-side view thereof;

1.3 is a front view thereof;

1.4 is a top view thereof; and

1.5 is a bottom view thereof.

The broken lines shown in the drawings depict portions of the headphone that form no part of the claimed design. 

CLAIM The ornamental design for headphone, as shown and described. 